TA Engineering (General). Civil engineering (General) 79 QA75 Electronic computers. Computer science 38 TJ Mechanical engineering and machinery 30 TP Chemical technology 22 TH Building construction 21 HD28 Management. Industrial Management 17 HD1394-1394.5 Real estate management 14 G70.212-70.215 Geographic information system 13 NA Architecture 12 QA76 Computer software 12 HD Industries. Land use. Labor 11 QE Geology 11 L Education (General) 10 LB Theory and practice of education 9 TK Electrical engineering. Electronics Nuclear engineering 9 HT101-395 Sociology, Urban 8 QA Mathematics 8 TS Manufactures 6 BP Islam. Bahaism. Theosophy, etc 5 QH Natural history 5 T Technology (General) 5 TK7885-7895 Computer engineer. Computer hardware 5 Unspecified 5 G Geography (General) 4 TD Environmental technology. Sanitary engineering 4 TH434-437 Quantity surveying 4 LB1603 Secondary Education. High schools 3 LC Special aspects of education 3 VM Naval architecture. Shipbuilding. Marine engineering 3 HE Transportation and Communications 2